ping is a real prob on here,thats why people don`t stay very long on mp,just keep trying

That is one problem why people don't play Doom 3 mp. I could think of other reasons...Like I don't want to sound off as an elitist ♥♥♥♥♥♥ or something, but I would think the skillcap is somewhat higher than counter strike and tf2 for sure...

I also think the multiplayer part for doom 3 was kind of a little minigame compared to it's single player.